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Encryption level values are decoupled from ssl_encryption_level_t,
which is now limited to BoringSSL QUIC callbacks, with mappings
provided. Although the values match, this provides a technically
safe approach, in particular, to access protection level sized arrays.
In preparation for using OpenSSL 3.5 TLS callbacks.
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This follows OpenSSL and BoringSSL API, and gives a hint to compiler
that this parameter may not be modified.
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It is made local as it is only needed now when creating crypto context.
BoringSSL lacks EVP interface for ChaCha20, providing instead
a function for one-shot encryption, thus hp is still preserved.
Based on a patch by Roman Arutyunyan.
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After conversion to reusable crypto ctx, now there's enough caller
context to remove the "level" argument from ngx_quic_ciphers().
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Now these functions have names ngx_quic_crypto_XXX():
- ngx_quic_tls_open() -> ngx_quic_crypto_open()
- ngx_quic_tls_seal() -> ngx_quic_crypto_seal()
- ngx_quic_tls_hp() -> ngx_quic_crypto_hp()
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Keys may be released by TLS stack in different times, so it makes sense
to check this independently as well. This allows to fine-tune what key
direction is used when checking keys availability.
When discarding, server keys are now marked in addition to client keys.
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Since at least f9fbeb4ee0de and certainly after 924882f42dea, which
TLS Key Update support predates, queued data output is deferred to a
posted push handler. To address timing signals after these changes,
generating next keys is now posted to run after the push handler.
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Previously used constant EVP_GCM_TLS_TAG_LEN had misleading name since it was
used not only with GCM, but also with CHACHAPOLY. Now a new constant
NGX_QUIC_TAG_LEN introduced. Luckily all AEAD algorithms used by QUIC have
the same tag length of 16.
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The change allows to compile QUIC with OpenSSL which lacks BoringSSL QUIC API.
This implementation does not support 0-RTT.
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The ngx_quic_keys_t structure is now exposed.
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While here, removed check for encryption level zero, redundant by its nature.
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Stop including QUIC headers with no user-serviceable parts inside.
This allows to provide a much cleaner QUIC interface. To cope with that,
ngx_quic_derive_key() is now explicitly exported for v3 and quic modules.
Additionally, this completely hides the ngx_quic_keys_t internal type.
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Draft-29 and beyond are now supported simultaneously, no need to recompile.
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The token generation in QUIC is reworked. Single host key is used to generate
all required keys of needed sizes using HKDF.
The "quic_stateless_reset_token_key" directive is removed. Instead, the
"quic_host_key" directive is used, which reads key from file, or sets it
to random bytes if not specified.
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